Dannies questions
What is a planetesimal?
Space objects built by solid particles that can form planets threw collisions and mergers.
Why do astronomers often send instruments into space and why?
To collect information because earth's atmosphere interferes with most radiation
How many layers does the sun have?
3 layers.
Who first proposed the heliocentric model of the solar system?
Copernicus
What is retrograde motion
The apparent backward movement of a planet.
How does electromagnetic radiation help scientists study the universe?
All stars have their own EM radiation, and from that scientists can find out the star's heat, light, temperature, etc.
What is a constellation?
A group of stars that make recognizable patterns.
Where do most meteorites originate?
Asteroid belt
What is an ellipse?
An oval shape that centered on two points instead of a single point.
What are the craters on the moon called?
Impact craters
What is a black hole?
A region of spacetime where gravity is so strong that nothing can escape from it.
A ____ is a rocky object that strikes Earth’s surface.
Meteor
What is an astronomical unit?
The distance that space is often measured in (1.496x 108 km)
What is the giant impact theory?
The moon formed as a result of a collision between earth and mars sized objects about 4.5 billion years ago.
What are binary stars?
When only 2 stars are gravitationally bound together and orbit a common center of mass.
What is eccentricity
Ratio of distance between the foci to the length of the major axis.
What are solar flares?
solar flares are violent eruptions of particles and radiation from the surface of the sun.